Traceable Coulomb blockade thermometry

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Aivon Oy
  • VTT Technical Research Centre of Finland

Abstract

We present a measurement and analysis scheme for determining traceable thermodynamic temperature at cryogenic temperatures using Coulomb blockade thermometry. The uncertainty of the electrical measurement is improved by utilizing two sampling digital voltmeters instead of the traditional lock-in technique. The remaining uncertainty is dominated by that of the numerical analysis of the measurement data. Two analysis methods are demonstrated: numerical fitting of the full conductance curve and measuring the height of the conductance dip. The complete uncertainty analysis shows that using either analysis method the relative combined standard uncertainty (k = 1) in determining the thermodynamic temperature in the temperature range from 20 mK to 200 mK is below 0.5%. In this temperature range, both analysis methods produced temperature estimates that deviated from 0.39% to 0.67% from the reference temperatures provided by a superconducting reference point device calibrated against the Provisional Low Temperature Scale of 2000.

Details

Original languageEnglish
Article number69
Pages (from-to)69-76
Number of pages8
JournalMetrologia
Volume54
Issue number1
Publication statusPublished - Feb 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • Coulomb blockade thermometry, primary thermometer, traceability, thermodynamic temperature, TUNNEL-JUNCTIONS, ARRAYS, REGIME, KELVIN

ID: 10728192